-15=-4a+7a

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Solution for -15=-4a+7a equation: 



-15=-4a+7a

We move all terms to the left:

-15-(-4a+7a)=0

We add all the numbers together, and all the variables

-(+3a)-15=0

We get rid of parentheses

-3a-15=0

We move all terms containing a to the left, all other terms to the right

-3a=15

a=15/-3

a=-5

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